Four New 2-(2-Phenylethyl)-4H-chromen-4-one Derivatives from the Resinous Wood of Aquilaria sinensis and Their Inhibitory Activities on Neutrophil Pro-Inflammatory Responses.

Four new 2-(2-phenylethyl)-4-chromen-4-one derivatives, 6-hydroxy-5-methoxy-2-[2-(4'-methoxyphenyl)ethyl]chromone (1: ), 6,7-dimethoxy-2-[2-(2'-hydroxyphenyl)ethyl]chromone (2: ), 5-hydroxy-6-methoxy-2-[2-(3'-methoxyphenyl)ethyl]-chromone (3: ), and 7-chloro-8-hydroxy-2-[2-(4'-methoxyphenyl)ethyl]chromone (4: ), have been isolated from the resinous wood of , together with 16 known compounds (5: -20: ). Among these, 7-methoxy-2-[2-(4'-methoxyphenyl)ethyl]chromone (5: ) was isolated from a natural source for the first time. The structures of the new compounds were established by spectroscopic analyses (1D and 2D NMR, HR-ESI-MS, IR, UV). Nine compounds, including 1: showed more than 80% inhibition of superoxide anion generation by human neutrophils in response to formyl-L-methionyl-L-leucyl-L-phenylalanine at 50 µM.